Mitsubishi Galant. Manual — part 546

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37A-15

2. Move the ball joint stud several times and install the nut on

the stud. Measure the ball joint breakaway torque with
special tool MB990326.

Standard value: 0.5

−−−−

2.5 N

⋅⋅⋅⋅

m (4.4

−−−−

22.1 in-lb)

3. If the breakaway torque exceeds the standard value, replace

the tie rod end.

4. If the breakaway torque is under the standard value, check

the ball joint for end play or ratcheting. If no end play or
ratcheting, the ball joint can be re-used.

5. Tighten the nut to the specified torque and install a new

cotter pin.

Tightening torque: 24

−−−−

33 N

⋅⋅⋅⋅

m (17

−−−−

25 ft-lb)

STATIONARY STEERING EFFORT CHECK

M1372001700053

1. With the vehicle stopped on a flat and paved surface, turn

the steering wheel to the straight ahead position.

2. Start the engine and check the engine idle speed.

Standard value:

3. Attach a spring scale to the outer circumference of the

steering wheel and measure the steering force required to
turn the steering wheel from the straight ahead position to
the left and right (within a range of 1.5 turns). Also check to
be sure that there is no significant fluctuation of the required
steering effort.

Standard value:
Steering effort: 30 N (6.7 lb) or less
Fluctuation allowance: 5.9 N (1.33 lb) or less

STEERING WHEEL RETURN TO CENTER CHECK

M1372001800050

Conduct a road test:
1. Make both gradual and sudden turns and check the steering

wheel return.

ACX01129 AB

MB990326

ENGINE

ENGINE IDLE SPEED r/min

2.4L Engine

750

±

100

3.0L Engine

700

±

100

ACX01122AB

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37A-16

2. At a speed of approximately 35 km/h (22 mph), turn the

steering wheel 90 degrees, hold a few seconds, then
release. If the steering wheel then returns 70 degrees or
more, the return can be judged satisfactory.

NOTE: There will be a momentary feeling or "heaviness"
when the wheel is turned quickly, but this is not abnormal.
(Oil pump discharge amount is especially apt to be
insufficient during idling.)

DRIVE BELT TENSION CHECK

M1372001900057

Refer to GROUP 00, Maintenance Service

−

Drive Belts

P.00-

39

.

FLUID LEVEL CHECK

M1372002000057

1. Park the vehicle on a flat, level surface, start the engine, and

then turn the steering wheel several times to raise the
temperature of the fluid to approximately 50

−

60

°

C (122

−

140

°

F).

2. With the engine running, turn the wheel all the way to the left

and right several times.

3. Check the fluid in the oil reservoir for foaming or milkiness.

Check the difference of the fluid level when the engine is
stopped, and while it is running. If the change of the fluid
level is 5 mm (0.2 inch) or more, air bleeding should be
done.

FLUID REPLACEMENT

M1372002100054

1. Raise and support the front wheels.

2. Disconnect the return hose connection.

3. Connect a vinyl hose to the return hose, and drain the fluid

into a container.

CAUTION

Be careful not to position the high-tension cable near the
fuel rail.
4. Disconnect the high-tension cable.

5. While operating the starting motor intermittently, turn the

steering wheel all the way to the left and right several times
to drain all of the fluid.

6. Connect the return hose securely, and then secure with the

clip.

7. Fill the oil reservoir with MITSUBISHI POWER STEERING

FLUID up to the lower position of the filler, and then bleed
the air.

POWER STEERING SYSTEM BLEEDING

M1372002200051

Perform air bleeding procedure as necessary after replacing
the steering gear box or the steering fluid lines.

ACX01130AB

70˚

70˚

ACX01131

WHILE ENGINE
RUNNING

AC

FLUID LEVEL CHANGE:WITHIN 5 mm (0.2 in)

WHILE ENGINE
STOPPED

AC003389

RETURN HOSE

RETURN
HOSE

VINYL
HOSE

AB

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37A-17

1. Raise and support the front wheels.

2. Disconnect the high-tension cable. Turn the steering wheel

all the way to the left and right five or six times while using
the starter motor to crank the engine intermittently several
times (for 15 to 20 seconds).

CAUTION

•

Be careful not to place the high-tension cable near the
fuel rail.

•

Perform air bleeding only while cranking the engine. If
air bleeding is performed while the engine is running,
air could enter the fluid. During air bleeding, refill the
steering fluid supply so that the level never falls below
the lower mark on the dipstick.

3. Connect the high-tension cable. Start the engine (idling).

4. Turn the steering wheel to the left and right until there are no

air bubbles in the oil reservoir.

5. Confirm that the fluid is not milky, and that the level is

between the high and low dipstick marks.

6. Confirm that there is very little change in the fluid level when

the steering wheel is turned left and right.

7. Confirm that the change in the fluid level is no more than 5

mm (0.2 inch) when the engine is stopped and when it is
running.

CAUTION

If the fluid level rises suddenly after the engine is stopped,
the air has not been completely bled. If air bleeding is not
complete, there will be abnormal noises from the pump
and the flow-control valve, and this condition could cause
reduce the life of the power steering components.
8. If the change of the fluid level is 5 mm (0.2 inch) or more, the

air has not been completely bled from the system. Air
bleeding procedure must be repeated.

ACX01131

WHILE ENGINE
RUNNING

AC

FLUID LEVEL CHANGE:WITHIN 5 mm (0.2 in)

WHILE ENGINE
STOPPED

ON-VEHICLE SERVICE

TSB Revision

POWER STEERING

37A-18

OIL PUMP PRESSURE TEST

M1372002300058

Required Special Tools:

•

MB990662: Pressure Gauge

•

MB991548: Power Steering Oil Pressure Gauge Adapter
(Pump Side)

•

MB991549: Power Steering Oil Pressure Gauge Adapter
(Hose Side)

1. Disconnect the pressure hose from the oil pump, and then

connect special tools MB991548, MB990662 and
MB991549.

2. Bleed air, then turn the steering wheel several times while

the vehicle is not moving so that the temperature of the fluid
rises to approximately 50

−

60

°

C (122

−

140

°

F).

3. Start the engine and idle it at 1,000

±

100 r/min.

CAUTION

The pressure gauge shut-off valve must not remain closed
for more than 10 seconds.
4. Fully close the shut-off valve of the pressure gauge and

measure the oil pump relief pressure to confirm that it is
within the standard value range. Open it again immediately
after checking the pressure.

Standard value: 8.3

−−−−

9.5 MPa (1,209

−−−−

1,280 psi)

5. If it is not within the standard value, replace the oil pump.

6. Check whether or not the hydraulic pressure is the standard

value when no-load conditions are created by fully opening
the shut-off valve of the pressure gauge.

Standard value: 0.8

−−−−

1.0 MPa (116

−−−−

145 psi)

7. If it is not within the standard value, the probable cause is a

malfunction of the oil line or steering gear box, so check
these parts and repair as necessary.

8. Turn the steering wheel all the way to the left or right; then

check whether or not the retention hydraulic pressure is the
standard value.

Standard value: 8.3

−−−−

9.5 MPa (1,209

−−−−

1,280 psi)

9. If not the standard value, overhaul the steering gear box.

Remeasure fluid pressure.

10.Remove special tools MB991548, MB990662 and

MB991549, and then tighten the pressure hose to the
specified torque.

Tightening torque: 57 N

⋅⋅⋅⋅

m (42 ft-lb)

11.Bleed the system.

ACX01133

THERMO-
METER

RESERVOIR

ADAPTER
(MB991548)

OIL
PUMP

ADAPTER
(MB991549)

AB

SHUT-OFF VALVE
(FULLY CLOSED)

PRESSURE
GAUGE
(MB990662)